Surfing the web on an iPhone at home, how do you know if you are on wifi or cellular since both bars appear.?

Are we to assume that when the wifi bars are there, then it is the default, or is there a more definitive way to be certain?

I just don't want to use up my cellular internet time when on the internet in a wifi hot spot like home or work.Surfing the web on an iPhone at home, how do you know if you are on wifi or cellular since both bars appear.?
The bars that you see have nothing to do with EDGE or Wi-Fi. Those bars tell you how good your signal strength is at that moment. If all of the bars are there, then you have great service and if there are one to two bars there, then you are more likely to get dropped from a phone call. The only way that EDGE comes into play with the bars is if you have one bar of service, then EDGE may not be available.



You can know if you are using EDGE or Wi-Fi by looking to the right of the bars. If there is a small blue box with an "E" in it, then you are using EDGE. If there is a three or four curved lines, then you are using a Wi-Fi connection.



It is a little hard to explain, but I hope you understand.